Mechanical Engineering - Thermodynamics

26. 

The value of specific heat at constant pressure (cp) is __________ that of at constant volume (cv).

A. less than
B. equal to
C. more than

Answer: Option C

Explanation:

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27. 

When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel, the process is known as __________ of fuel.

A. atomisation
B. carbonisation

Answer: Option B

Explanation:

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28. 

Which of the following is correct?

A. Absolute pressure = Gauge pressure + Atmospheric pressure
B. Gauge pressure = Absolute pressure + Atmospheric pressure
C. Atmospheric pressure = Absolute pressure + Gauge pressure
D. Absolute pressure = Gauge pressure - Atmospheric pressure

Answer: Option A

Explanation:

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29. 

The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and recondensed, then the liquid with the next higher boiling point is then evaporated and recondensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called

A. cracking
B. carbonisation
C. fractional distillation
D. full distillation

Answer: Option C

Explanation:

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30. 

Which of the following statement is incorrect?

A. The liquid fuels consist of hydrocarbons.
B. The liquid fuels have higher calorific value than solid fuels.
C. The solid fuels have higher calorific value than liquid fuels.
D. A good fuel should have low ignition point.

Answer: Option C

Explanation:

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